Method for surface treatment of an internal combustion pistion and an internal combustion piston
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United States of America Patent
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Jul 31, 2012
Grant Date -
Nov 4, 2010
app pub date -
May 10, 2010
filing date -
Jul 28, 2006
priority date (Note) -
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Abstract
An internal combustion piston comprises a modified layer produced by a surface treatment including injecting injection powders having a diameter of 20 μm to 400 μm and containing a reinforcing element to be collided with a surface of the internal combustion piston obtained by casting and forging by injecting at an injection speed of 80 m/s or more or at an injection pressure of 0.3 MPa or more, the reinforcing element improving a strength of an alloy comprising the piston when being diffused and penetrated in the alloy, wherein by the surface treatment, oxides generated on the surface of the piston by the casting and forging are removed, and surface flaws generated on the surface are repaired, whereby the modified layer is formed to have a uniformly fine-grained metal microstructure which contains the reinforcing element in the injection powders diffused and penetrated in the vicinity of the surface of the piston and an alloy element of the alloy comprising the piston.
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